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--LettersPdtent 1V0. 77,763,,dated May 1 2, 1868.

IMPROVED PAINT ro'n LIQUID commssus, a.

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To ALL punsons mo .wHoM'; Tunes PRESENTS SHALL COME;

Be it known that I, EDWARD -S.- Ri'ronm of Brookline, in the county of Norfolk, and State of Massachusetts, have mad'ea new and useful Invention having reference to Paint which is to beexposed' to the action of alcohol, or an alcoholic mixture, when used inwhat is termed at Liquid Compass and I do hereby declare the nature of my invention, and the-manner in which is to be compounded, be described-as follows:

Commoupaint, whenspplied to the cards of liquid compasses, employed on shipboard for indicating the .rhegntetic course or hearing of an objec't,;i s liable to bedestroyed or injured by the alcoholic mixture within which the cards are floated or submerged. I I To prevent this destructive or injurious action of the liquid, I not only combine or mix, with the pigment or pigments to be employed in producingItho paint, a quantity of albumen, c'useine, or the equivalent thereof, .but,'with or after' the application of the compound or mixture to *tho surface or surfaces on which-it is to be spread l efi'ect coagulation of the albumen or-caseiue' byvthe action of lime, heat, or other substance-or matter well known as proper for such'purposs.-' 7

If we suppose the pigment o'r pigments used to be dry whitelcadyorthe same anda smallquantity of lime, the same should be quickly and thoroughly incorporated with a suflicient quantity of the albumen to bring the mixture to the consistency required for paintingit on'a su1'face. Immediately after-the accomplishment of this, the mixture should be applied to the surface or compass-card intended to receive it, or the pigment and albumen may be mixed and put'ou the surface, and coagulation'eii'ected, by'an after application of solution -0f lime, or-

by the action of heat -or other agent capable oi producing coagulation. Nesta-the part so painted, and the paint on it, m-ay,'if desirable, be exposed to a temperature such as will insure coagulation'of thealbulnen, with or without the aid of lime or its equivalent. One 'orlmore coats of the point may be applied to the surfaee or article, coagulation of the albumen of each beinglefl'ectcd'in 'liko manner. v to Experiencehas demonstrated that a paint so made, and applied 'to a surface exposedto alcohol, will retain its color, and remain uninjured, for almost any length of timc. I Albumen, caseine, and'hvarious like substances, are not soluble in or'clestructible by alcohol, nor will they I decomposewhilc submergd therein'. 'lhus,'it will be seen that, withthe albumen used as .a vehiclefor the pig'- meat or pigments, the point, when applied to the compass-card; or the interior-surface of the comnassb'ox, will not be washed therefrom, or huve its eolorchangcd, by thcliquid contained in the box.

What I claim as my invention, is

The application to a compass-card, or other article to be exposed to alcohol or an nlcoholictmixturc, as set forth, apaint composed of one or more pigments and a coagulating-material, (such as albumen, for instance,)

tand then, or subsequentlxeilcecting coagulation of the vehiclo,' the whole being substantially as and for the purpose'abovspecified." I

p n s. RITCHIE.

Witnesses:

Fi-B. Hann,,Jr.,- J. It. Snow." 

